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Need help does it have a option to desulphate recondition mode or it will only detect it? Can you go directly into desulphate mode? Manually? Or the computer decides?

Since my second battery resting at 12.3 2yr old Duracell agm group 31. What setting should I use on the ctek? Reg mode or try recondition﻿ mode? What the difference because doesn't the reg mode desulphate as the first step anyways?